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| Characteristics of the Pneumatic Servovalve with Symmetric Uneven Underlaps |
| YIN Yaobao1,LI Changming1,ARAKI Kenji2 |
| (1. College of Mechanical Engineering, Tongji University, Shanghai 200092, China；2. Saitama University, Saitama 3388570, Japan) |
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Abstract A pneumatic servovalve with even underlaps or uneven underlaps and its characteristics of control orifices were discussed. The pressure of the steadystate working point at x=0 is as much as 80% of the supply pressure for a servovalve with symmetric and even underlaps of the spool valve. But it is less than 80% of the supply pressure for a servovalve with symmetric but uneven underlaps where the underlaps of upstream is less than that of downstream. And it is larger than 80% of the supply pressure for a servovalve with symmetric but uneven underlaps where the underlaps of upstream is larger than that of downstream. Either a pneumatic servovalve with symmetric and even underlaps, or a pneumatic servovalve with symmetric and uneven underlaps has maximal leakage flow rate on neutral position of the spool valve. The theoretical results are in good agreement with the experimental results.
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Received: 16 July 2009
Published: 29 April 2010
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